Japan’s government will reportedly state that North Korea is capable of miniaturising nuclear warheads in a forthcoming defence report, it has emerged.

Tokyo will upgrade its estimate of the regime’s nuclear capability, having said last year only that the technical feat was a possibility, the conservative Yomiuri Shimbun newspaper said on Wednesday, without citing sources.

The defence report will maintain Japan’s contention that North Korea’s nuclear and ballistic missile programmes pose a “serious and imminent threat” to its security after recent meetings between Donald Trump and the North’s leader, Kim Jong-un, failed to make progress on denuclearisation.

The report is expected to receive cabinet approval in mid-September, the Yomiuri said.